Update structopt requirement from ^0.2 to ^0.3 in /examples

[dependabot-preview]

Updates the requirements on structopt to permit the latest version.

Changelog

Sourced from structopt's changelog.

v0.3.0 (2019-08-30)

Breaking changes

Bump minimum rustc version to 1.36 by @​TeXitoi

Now rustc 1.36 is the minimum compiler version supported by structopt,
it likely won't work with older compilers.

Remove "nightly" feature

Once upon a time this feature had been used to enable some of improvements
in proc-macro2 crate that were available only on nightly. Nowadays this feature doesn't
mean anything so it's now removed.

Support optional vectors of arguments for distinguishing between -o 1 2, -o and no option provided at all by @​sphynx (#180).

#[derive(StructOpt)] struct Opt { #[structopt(long)] fruit: Option<Vec<String>>, } fn main() { assert_eq!(Opt::from_args(&["test"]), None); assert_eq!(Opt::from_args(&["test", "--fruit"]), Some(vec![])); assert_eq!(Opt::from_args(&["test", "--fruit=apple orange"]), Some(vec!["apple", "orange"])); }

If you need to fall back to the old behavior you can use a type alias:

type Something = Vec<String>; #[derive(StructOpt)] struct Opt { #[structopt(long)] fruit: Option<Vec<String>>, }

Change default case from 'Verbatim' into 'Kebab' by @​0ndorio (#202).

structopt 0.3 uses field renaming to deduce a name for long options and subcommands.

#[derive(StructOpt)] struct Opt { #[structopt(long)] http_addr: String, // will be renamed to `--http-addr` #[structopt(subcommand)] </tr></table> ... (truncated)

Commits

• 673dbcc Bump minimum rustc version to 1.36
• b57dde1 Update dependencies (#227)
• 8830771 Update documentation and changelog (#236)
• 6bd1a69 Update keyvalue example (#234)
• 73db781 Update raw_bool_literal.rs (#231)
• 2363815 Update changelog
• dc5ec7a Emit error about raw removal
• a91109c Change behavior of about/author/version and ad no_version
• 5dfa606 Now error messages highlight the error location (#225)
• 94946c3 Add documentation for env (#221)
• Additional commits viewable in compare view

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